<template>
  <view
    class="uv-checkbox"
    :style="[checkboxStyle]"
    @tap.stop="wrapperClickHandler"
    :class="[
      `uv-checkbox-label--${parentData.iconPlacement}`,
      parentData.borderBottom && parentData.placement === 'column' && 'uv-border-bottom',
    ]"
  >
    <view class="uv-checkbox__icon-wrap" @tap.stop="iconClickHandler" :class="iconClasses" :style="[iconWrapStyle]">
      <slot name="icon">
        <uv-icon class="uv-checkbox__icon-wrap__icon" name="checkbox-mark" :size="elIconSize" :color="elIconColor" />
      </slot>
    </view>
    <view class="uv-checkbox__label-wrap" @tap.stop="labelClickHandler">
      <slot>
        <text
          :style="{
            color: elDisabled ? elInactiveColor : elLabelColor,
            fontSize: elLabelSize,
            lineHeight: elLabelSize,
          }"
          >{{ label }}</text
        >
      </slot>
    </view>
  </view>
</template>

<script>
import mpMixin from '@/uni_modules/uv-ui-tools/libs/mixin/mpMixin.js'
import mixin from '@/uni_modules/uv-ui-tools/libs/mixin/mixin.js'
import props from './props.js'
/**
 * checkbox  复选框
 * @description 复选框组件一般用于需要多个选择的场景，该组件功能完整，使用方便
 * @tutorial https://www.uvui.cn/components/checkbox.html
 * @property {String | Number | Boolean}	name			checkbox组件的标示符
 * @property {String}						shape			形状，square为方形，circle为圆型
 * @property {String | Number}				size			整体的大小
 * @property {Boolean}						checked			是否默认选中
 * @property {String | Boolean}				disabled		是否禁用
 * @property {String}						activeColor		选中状态下的颜色，如设置此值，将会覆盖parent的activeColor值
 * @property {String}						inactiveColor	未选中的颜色
 * @property {String | Number}				iconSize		图标的大小，单位px
 * @property {String}						iconColor		图标颜色
 * @property {String | Number}				label			label提示文字，因为nvue下，直接slot进来的文字，由于特殊的结构，无法修改样式
 * @property {String}						labelColor 		label的颜色
 * @property {String | Number}				labelSize		label的字体大小，px单位
 * @property {String | Boolean}				labelDisabled	是否禁止点击提示语选中复选框
 * @property {Object}						customStyle		定义需要用到的外部样式
 *
 * @event {Function}	change	任一个checkbox状态发生变化时触发，回调为一个对象
 * @example <uv-checkbox v-model="checked" :disabled="false">天涯</uv-checkbox>
 */
export default {
  name: 'uv-checkbox',
  mixins: [mpMixin, mixin, props],
  data() {
    return {
      isChecked: false,
      // 父组件的默认值，因为头条小程序不支持在computed中使用this.parent.shape的形式
      // 故只能使用如此方法
      parentData: {
        iconSize: 12,
        labelDisabled: null,
        disabled: null,
        shape: 'square',
        activeColor: null,
        inactiveColor: null,
        size: 18,
        value: null,
        modelValue: null,
        iconColor: null,
        placement: 'row',
        borderBottom: false,
        iconPlacement: 'left',
        labelSize: 14,
        labelColor: '#303133',
      },
    }
  },
  computed: {
    // 是否禁用，如果父组件uv-raios-group禁用的话，将会忽略子组件的配置
    elDisabled() {
      return this.disabled !== '' ? this.disabled : this.parentData.disabled !== null ? this.parentData.disabled : false
    },
    // 是否禁用label点击
    elLabelDisabled() {
      return this.labelDisabled !== ''
        ? this.labelDisabled
        : this.parentData.labelDisabled !== null
          ? this.parentData.labelDisabled
          : false
    },
    // 组件尺寸，对应size的值，默认值为21px
    elSize() {
      return this.size ? this.size : this.parentData.size ? this.parentData.size : 21
    },
    // 组件的勾选图标的尺寸，默认12px
    elIconSize() {
      return this.iconSize ? this.iconSize : this.parentData.iconSize ? this.parentData.iconSize : 12
    },
    // 组件选中激活时的颜色
    elActiveColor() {
      return this.activeColor ? this.activeColor : this.parentData.activeColor ? this.parentData.activeColor : '#2979ff'
    },
    // 组件选未中激活时的颜色
    elInactiveColor() {
      return this.inactiveColor
        ? this.inactiveColor
        : this.parentData.inactiveColor
          ? this.parentData.inactiveColor
          : '#c8c9cc'
    },
    // label的颜色
    elLabelColor() {
      return this.labelColor ? this.labelColor : this.parentData.labelColor ? this.parentData.labelColor : '#606266'
    },
    // 组件的形状
    elShape() {
      return this.shape ? this.shape : this.parentData.shape ? this.parentData.shape : 'circle'
    },
    // label大小
    elLabelSize() {
      return this.$uv.addUnit(
        this.labelSize ? this.labelSize : this.parentData.labelSize ? this.parentData.labelSize : '15',
      )
    },
    elIconColor() {
      const iconColor = this.iconColor
        ? this.iconColor
        : this.parentData.iconColor
          ? this.parentData.iconColor
          : '#ffffff'
      // 图标的颜色
      if (this.elDisabled) {
        // disabled状态下，已勾选的checkbox图标改为elInactiveColor
        return this.isChecked ? this.elInactiveColor : 'transparent'
      } else {
        return this.isChecked ? iconColor : 'transparent'
      }
    },
    iconClasses() {
      let classes = []
      // 组件的形状
      classes.push('uv-checkbox__icon-wrap--' + this.elShape)
      if (this.elDisabled) {
        classes.push('uv-checkbox__icon-wrap--disabled')
      }
      if (this.isChecked && this.elDisabled) {
        classes.push('uv-checkbox__icon-wrap--disabled--checked')
      }
      // 支付宝，头条小程序无法动态绑定一个数组类名，否则解析出来的结果会带有","，而导致失效
      // #ifdef MP-ALIPAY || MP-TOUTIAO
      classes = classes.join(' ')
      // #endif
      return classes
    },
    iconWrapStyle() {
      // checkbox的整体样式
      const style = {}
      style.backgroundColor = this.isChecked && !this.elDisabled ? this.elActiveColor : '#ffffff'
      style.borderColor = this.isChecked && !this.elDisabled ? this.elActiveColor : this.elInactiveColor
      style.width = this.$uv.addUnit(this.elSize)
      style.height = this.$uv.addUnit(this.elSize)
      // 如果是图标在右边的话，移除它的右边距
      if (this.parentData.iconPlacement === 'right') {
        style.marginRight = 0
      }
      return style
    },
    checkboxStyle() {
      const style = {}
      if (this.parentData.borderBottom && this.parentData.placement === 'row') {
        this.$uv.error('检测到您将borderBottom设置为true，需要同时将uv-checkbox-group的placement设置为column才有效')
      }
      // 当父组件设置了显示下边框并且排列形式为纵向时，给内容和边框之间加上一定间隔
      if (this.parentData.borderBottom && this.parentData.placement === 'column') {
        style.paddingBottom = '8px'
      }
      return this.$uv.deepMerge(style, this.$uv.addStyle(this.customStyle))
    },
  },
  created() {
    this.init()
  },
  methods: {
    init() {
      // 支付宝小程序不支持provide/inject，所以使用这个方法获取整个父组件，在created定义，避免循环引用
      this.updateParentData()
      if (!this.parent) {
        this.$uv.error('uv-checkbox必须搭配uv-checkbox-group组件使用')
      }
      this.$nextTick(() => {
        let parentValue = []
        if (this.parentData.value.length) {
          parentValue = this.parentData.value
        } else if (this.parentData.modelValue.length) {
          parentValue = this.parentData.modelValue
        }
        // 设置初始化时，是否默认选中的状态，父组件uv-checkbox-group的value可能是array，所以额外判断
        if (this.checked) {
          this.isChecked = true
        } else if (this.$uv.test.array(parentValue)) {
          // 查找数组是是否存在this.name元素值
          this.isChecked = parentValue.some((item) => {
            return item === this.name
          })
        }
      })
    },
    updateParentData() {
      this.getParentData('uv-checkbox-group')
    },
    // 横向两端排列时，点击组件即可触发选中事件
    wrapperClickHandler(e) {
      this.parentData.iconPlacement === 'right' && this.iconClickHandler(e)
    },
    // 点击图标
    iconClickHandler(e) {
      this.preventEvent(e)
      // 如果整体被禁用，不允许被点击
      if (!this.elDisabled) {
        this.setRadioCheckedStatus()
      }
    },
    // 点击label
    labelClickHandler(e) {
      this.preventEvent(e)
      // 如果按钮整体被禁用或者label被禁用，则不允许点击文字修改状态
      if (!this.elLabelDisabled && !this.elDisabled) {
        this.setRadioCheckedStatus()
      }
    },
    emitEvent() {
      this.$emit('change', this.isChecked)
      // 尝试调用uv-form的验证方法，进行一定延迟，否则微信小程序更新可能会不及时
      this.$nextTick(() => {
        this.$uv.formValidate(this, 'change')
      })
    },
    // 改变组件选中状态
    // 这里的改变的依据是，更改本组件的checked值为true，同时通过父组件遍历所有uv-checkbox实例
    // 将本组件外的其他uv-checkbox的checked都设置为false(都被取消选中状态)，因而只剩下一个为选中状态
    setRadioCheckedStatus() {
      // 将本组件标记为与原来相反的状态
      this.isChecked = !this.isChecked
      this.emitEvent()
      typeof this.parent.unCheckedOther === 'function' && this.parent.unCheckedOther(this)
    },
  },
  watch: {
    checked() {
      this.isChecked = this.checked
    },
  },
}
</script>

<style lang="scss" scoped>
$show-border: 1;
$show-border-bottom: 1;
@import '@/uni_modules/uv-ui-tools/libs/css/variable.scss';
@import '@/uni_modules/uv-ui-tools/libs/css/components.scss';
@import '@/uni_modules/uv-ui-tools/libs/css/color.scss';
$uv-checkbox-label-wrap-padding-right: 6px !default;
$uv-checkbox-icon-wrap-font-size: 6px !default;
$uv-checkbox-icon-wrap-border-width: 1px !default;
$uv-checkbox-icon-wrap-border-color: #c8c9cc !default;
$uv-checkbox-icon-wrap-icon-line-height: 0 !default;
$uv-checkbox-icon-wrap-circle-border-radius: 100% !default;
$uv-checkbox-icon-wrap-square-border-radius: 3px !default;
$uv-checkbox-icon-wrap-checked-color: #fff !default;
$uv-checkbox-icon-wrap-checked-background-color: red !default;
$uv-checkbox-icon-wrap-checked-border-color: #2979ff !default;
$uv-checkbox-icon-wrap-disabled-background-color: #ebedf0 !default;
$uv-checkbox-icon-wrap-disabled-checked-color: #c8c9cc !default;
$uv-checkbox-label-margin-left: 5px !default;
$uv-checkbox-label-margin-right: 12px !default;
$uv-checkbox-label-color: $uv-content-color !default;
$uv-checkbox-label-font-size: 15px !default;
$uv-checkbox-label-disabled-color: #c8c9cc !default;

.uv-checkbox {
  /* #ifndef APP-NVUE */
  @include flex(row);
  /* #endif */
  overflow: hidden;
  flex-direction: row;
  align-items: center;

  &-label--left {
    flex-direction: row;
  }

  &-label--right {
    flex-direction: row-reverse;
    justify-content: space-between;
  }

  &__icon-wrap {
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    // nvue下，border-color过渡有问题
    transition-property: border-color, background-color, color;
    transition-duration: 0.2s;
    /* #endif */
    color: $uv-content-color;
    @include flex;
    align-items: center;
    justify-content: center;
    color: transparent;
    text-align: center;
    font-size: $uv-checkbox-icon-wrap-font-size;
    border-width: $uv-checkbox-icon-wrap-border-width;
    border-color: $uv-checkbox-icon-wrap-border-color;
    border-style: solid;

    /* #ifdef MP-TOUTIAO */
    // 头条小程序兼容性问题，需要设置行高为0，否则图标偏下
    &__icon {
      line-height: $uv-checkbox-icon-wrap-icon-line-height;
    }

    /* #endif */

    &--circle {
      border-radius: $uv-checkbox-icon-wrap-circle-border-radius;
    }

    &--square {
      border-radius: $uv-checkbox-icon-wrap-square-border-radius;
    }

    &--checked {
      color: $uv-checkbox-icon-wrap-checked-color;
      background-color: $uv-checkbox-icon-wrap-checked-background-color;
      border-color: $uv-checkbox-icon-wrap-checked-border-color;
    }

    &--disabled {
      background-color: $uv-checkbox-icon-wrap-disabled-background-color !important;
    }

    &--disabled--checked {
      color: $uv-checkbox-icon-wrap-disabled-checked-color !important;
    }
  }

  &__label {
    /* #ifndef APP-NVUE */
    word-wrap: break-word;
    /* #endif */
    margin-left: $uv-checkbox-label-margin-left;
    margin-right: $uv-checkbox-label-margin-right;
    color: $uv-checkbox-label-color;
    font-size: $uv-checkbox-label-font-size;

    &--disabled {
      color: $uv-checkbox-label-disabled-color;
    }
  }

  &__label-wrap {
    flex: 1;
    padding-left: $uv-checkbox-label-wrap-padding-right;
  }
}
</style>
